feat(global-fonts): restructure directory and add Noto CJK variable fonts

[Jiwoon-Kim]

Props @ryelle for the original font enqueue implementation

Summary

• Refactored the global-fonts directory structure for better clarity and scalability.
• Created a new NotoCJK directory with Sans/ and Serif/ subdirectories.
• Removed ambiguous noto and notoserif directories and consolidated them under NotoCJK.
• Added NotoSans and NotoSerif CJK VariableFont_wght.woff2 files for HK, JP, KR, SC, and TC regions.

Details

• Existing files in the old NotoSerif directory remain intact.
• Recompressed existing fonts to .woff2; file sizes slightly reduced for unknown reasons, but verified to be functional.
• this PR only includes the font files and directory restructuring.

Changes

• Added: mu-plugins/global-fonts/NotoCJK/Sans/
• Added: mu-plugins/global-fonts/NotoCJK/Serif/
• Added: NotoSans* and NotoSerif* CJK VariableFont files (.woff2) for HK, JP, KR, SC, and TC.

Notes

• No functionality changes in themes yet.
• Path updates in theme enqueue functions will be handled separately.

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💡 Korean summary (설명용)

• 글로벌 폰트 디렉토리의 noto, notoserif를 정리하고 NotoCJK 디렉토리로 통합
• NotoCJK/Sans, NotoCJK/Serif로 디렉토리 구조 리팩토링
• HK, JP, KR, SC, TC용 NotoSans, NotoSerif CJK VariableFont .woff2 추가
• 기존 NotoSerif 폰트는 유지, 압축해서 약간 용량 감소 확인
• 테마 경로는 아직 수정하지 않음. 파일만 정리 완료

https://github.com/google/woff2 sudo apt update sudo apt install make g++ git cd /mnt/c/Users/thaum/dev

git clone --recursive https://github.com/google/woff2.git cd woff2 make clean all

./woff2_compress /mnt/c/Users/thaum/dev/noto/NotoSerifKR-VariableFont_wght.ttf ./woff2_compress /mnt/c/Users/thaum/dev/noto/NotoSansKR-VariableFont_wght.ttf

./woff2_compress /mnt/c/Users/thaum/dev/noto/NotoSerifJP-VariableFont_wght.ttf https://fonts.google.com/noto/specimen/Noto+Sans+JP ./woff2_compress /mnt/c/Users/thaum/dev/noto/NotoSansJP-VariableFont_wght.ttf

./woff2_compress /mnt/c/Users/thaum/dev/noto/NotoSerifSC-VariableFont_wght.ttf ./woff2_compress /mnt/c/Users/thaum/dev/noto/NotoSansSC-VariableFont_wght.ttf

./woff2_compress /mnt/c/Users/thaum/dev/noto/NotoSerifTC-VariableFont_wght.ttf https://fonts.google.com/noto/specimen/Noto+Sans+TC ./woff2_compress /mnt/c/Users/thaum/dev/noto/NotoSansTC-VariableFont_wght.ttf

./woff2_compress /mnt/c/Users/thaum/dev/noto/NotoSerifHK-VariableFont_wght.ttf ./woff2_compress /mnt/c/Users/thaum/dev/noto/NotoSansHK-VariableFont_wght.ttf

https://github.com/WordPress/wporg-mu-plugins/pull/686 https://github.com/WordPress/wporg-mu-plugins/pull/685 https://github.com/WordPress/wporg-mu-plugins/pull/684 https://github.com/WordPress/wporg-mu-plugins/pull/630 https://github.com/WordPress/wporg-parent-2021/issues/175